daaih bāau
大is big (the character looks like a person with arms spread), and 包 is bun (specifically a filled bun - non-filled is mantou, so 大包 is big bun.
Not to be confused with 打包 (dá bāau), which you say to indicate you want leftovers wrapped/boxed/bagged to go.
An extra large steamed bao (a meal in itself) typically filled with minced pork or chicken, Chinese sausage,boiled egg, or alterntively vegetables.
bao
taro bun
chicken bun
pan-fried pork bun